Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
duale studien » duale studium, scale studien, duales studium
texto duale » texto durante
e filologia » de filologia, di filologia, e fisiologia
studien e » studien es, studien _, studien 3

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "texto duale studien e filologia ((y literatura) OR (la literatura))".
• Adding a wildcard symbol may retrieve word variants: texto duale studien e filologia ((y literatura) OR (la literatura))*.